Because when there is new products to add, I want it in a certain order, but because it sorts them into the order of the ID, it will put them in the wrong order.
For example, I want an MP3 before a PDF. But if I've already uploaded the PDF, and then get my MP3 from my provider, then I can't just upload it because the MP3 will have a higher id number then the PDF. I have to remove the PDF, and then re-upload the MP3 before the PDF so that it's number will be lower. Eg, (MP3 might have an Id of 48, and the PDF'S ID might be 49. So it would put the MP3 first because it's ID is smaller...) Make sense?